Steam-generator



2 Sheets- Sheet l.

Patented May 10, 1892..

NN M /v W ub Il m \\\\\Q {lllll E m AEN. EN m E J. H. HOADLEY. STEAM GENERATOR.

(No Model.)

2 Sheets-Sheet 2.

l I I FEU i fJyl/E'zy fr J. H. HOADLEY. STEAM GENERATOR.

Patented May 10, 1892.

(No Model.)

NrTED STAT-ns PATENT OFFICE.

JOSEPH H. HOADLEY, OF SAN FRANCISCO, CALIFORNIA.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 474,385, dated May 10, 1892.

Application tiled December 9, 1891. Serial No. 414,459. (No model.)

.To @ZZ whom it may concern,.-

Be it known that I, JOSEPH H. HOADLEY, a citizen of the United States, residingfat San Francisco, inthe county of San Francisco and State of California, have invented a new and useful Improved Steam-Generator, of which the following, together with the accompanying drawings, is a specilication sufiiciently full, clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

The object of my present invention is to provide an efficient and economical steamgenerator arranged for the entry of the water, when it is at its lowest temperature, at the coldest part of the boiler and to have that water continue in its course, approaching the hottest part of the boiler on its way to the steam chamber, so that when the water reaches the lire-sheets it will be nearly at steam temperature, thus providing conditions for maximum efficiency in steaming qualities and obviating excessive expansion and contraction of the plates over the lire with the injurious effects incident thereto; also, to afford a boiler having a reservoir of hot water always ready to go into the lower compartment or boiler in case the water-lines should become low, thereby avoiding` the danger of turning cold water into a hot boiler and insuring the quick recovery of the water-level in the main boiler by gravity-pressure should any deficiency occur.

Another object is to provide a steam-generator comprising two separated water-compartments and an intermediate steam-compartment, through each of which the heated gases or products of combustion are passed on their way from the furnace to the stack, the several compartments disposed and connected in a manner to facilitate the manufacture and practical efficiency of the apparatus; also, to afford an interval or chamber between the overlying compartments, and means of communication from the exterior thereinto for permitting convenient access to the tube-sheets or inner heads of said compartments, as more fully hereinafter set forth. Another object is vto afford efficient facilities to dry the steam without loss of heat. These objects I attain by mechanism the nature and operation of which are explained inthe following description, and illustrated by the accompanying drawings, wherein-f- Figure l is a longitudinal sectional view of a steam-generator embodying my invention. Fig. 2 is a front view, with the projecting fluechamber in section at line Fig. l; and Fig. 3 is a transverse vertical section through the water-compartments at line y y, Fig. l.

My improved steam-generator comprises a primary boiler or water-compartment A, a main compartment or boiler B, and a steamcompartment or drying-chamber C. These compartments or boiler-sections are preferably made of similar diameter and structure and formed each of a cylindrical shell with transverse heads h, and a series of longitudinal tubes t, extending from end to end and secured in the heads in a manner similar to those generally employed in stationary tubular boilers.

The three shells or boiler-compartments A, B, and C are disposed within the brick-work or setting E of the furnace, between the upright inclosing walls, in horizontal position, the main boiler B being suspended immediately over the furnace F and fire-chamber F', while the steam-compartment C and Watercompartment A are disposed above and overlying this main boiler B, the two partsA and C being placed end to end axially in line with each other and with an interval or manholespace D of about two feet (more or less) between their adjacent ends. The front ends of the upper and lower shell are connected by a close partition at d, and their upper and lower half-cylinder sheets b and c are extended forward and joined by side plates f and inclosing doors H', as indicated, forming a flue-chamber H, that connects the lower and upper series of tubes. The shell of the compartment A is provided with a rearward extension a and door a2, forming a smokechamber J, from which the chimney flue or stack K rises.

The rear wall of the furnace is carried forward at G against the end of the boiler B, separating the combustion-chamber F from the space F2, which surrounds the upper sections of the boiler, so that the gases or products of combustion pass backward along the under side of the main boiler, then forward through the tubes of the compartment B, then up through chamber H, thence backward through the tubes of the steam-compartment or dryheater C into the space D, and thence through the tubes of the watercompartment or boiler A into the chamber .I and up the stack K.

The steam-compartment C and main boiler B are connected by a large open neck, as at L, to permit free passage of the steam into said steam-chamber as fast as it is generated, and the steam is delivered for use from the dome or pipe c.

The watercompartment A is connected with the boiler-compartment B by a stand-pipe or open trunk M, extending from the lower part of the compartment B nearly to the top of the compartment A, the arrangement being such that when the primary compartment A is full the Water will overflow through the trunk M into the boiler-chamber B.

Iindicates the Water-supply pipe,and I the feed-Water pipe leading into the primary Water-compartment A and for normally supplying the generator with water.

N indicates a pipe leading into the second compartment B, and N indicates the blow-off or escape pipe. These pipes preferably all connect With a cross-fitting at n and are severally provided with valves or stop-cocks 4, 5, 6, and 7 for controlling the flow of water, as

may be desired. When valves 4 and 5 are opened and valves 6 and 7 closed, the Water is fed into the compartment A, from which, when filled, it Hows through pipe M into the compartment B, wherein the water is maintained at the normal level indicated at w. By opening the valves 5 and 6, when the valves 4 and 7 are closed, the hot water from the compartment A can be quickly iiowed into the compartment B for supplying any deficiency therein, thus avoiding the necessity of injecting cold Water thereinto. By opening valves 6 and 7, with valves 4 and 5 closed, blow-off of the boiler B is effected, and by opening valves 5 and 7, With valves 4 and 6 closed, blow-off of the compartment A is effected.

The Steamsuperheater c and water-compartment A may be reversed in position in relation to the main boiler Bin case it is desired to have the products of combustion return through the space F2.

The lire-chamber F and grate g may be of any suitable or Well-known kind.

The several compartments of the generator are best provided with manholes lm., and a hand-hole m2 is formed in the end of the Watercompartment A- to facilitate removal of sediment. A soot-drop fr at the bottom of the space D affords means for readily cleaning out said space.

The means for mounting the boilers Within t their setting can be, as herein shown, by transor, if preferred, other forms of supports cati be used for sustaining the several boiler-sections in the relative positions indicated.

By the arrangement of the several compartments of the generator, as shown, the steam-drying chamber C is at an intermediate position, so that the gases passing through the same are utilized for superheating the steam while at suiiiciently high temperature to give eflicient practical results. Then by the subsequent passing of the gases through the boiler-section A, which contains the water at minimum temperature,a comparativelylarge percentage of the heat of the gases is transferred to the water contained in this primary heating-compartment, and the gases as they escape into the stack are at comparatively low temperature, thus avoiding Waste of heat, while at the same time the Water, being heated near or quite to the boiling-point within the compartment A and then overflowing through pipe M into the main compartment B, gives no chilling effect as it meets the hot platesover the fire-chamber, but is readily expanded into steam, which passes up into the coinpartment O, and is there subjected to the higher temperature, rendering it dry or s uperheated, the apparatus thus effecting its work in a very efficient, practical, and economical manner.

In another application for Letters Patent, Serial No. 413,161, I have described and claimed certain means for quickly delivering the heated Water from an upper to a lower compartment in cases of emergency in a boiler of other structure from that herein shown. It will therefore be understood that in this present application the claims refer to this subject-matter as an element" of the special combination herein illustrated and' partment having tubes or passages throughv which the products of combustion after passing the first boiler are carried and consisting of a steam-compartment, a Water-compart- IOC IIC

ment, and an interval-chamber or manholespace located within the cylinder between the adjacent inner ends of said compartments and having a manhole from the exterior thereinto, substantially as and for the purpose set forth.

2. The combination, with the horizontal tubular steam-boiler, of the horizontal tubular water-compartment disposed for receiving the heat of the escaping gases and products of combustiomand the open stand-pipe disposed within the interior of the boiler through the coupling-neck and connecting thefupper part of said water-compartment with said boiler for delivering water therefrom by overiowl-feed into said boiler, substantially as set ort i.

3. A steam-generator comprising two tubular Water-compartments, through which the products of combustion are passed on their Way from the iire-chamber to the chimney, connected by a trunk through Which the Water overflows from the upper to the lower compartment, in combination with a tubular steam-compartment, through which the products of combustion are passed intermediate to said two Water-compartments, and a lowdown supplemental pipe or way provided with a valve or stop-cock for transferring the contents of the upper Water-compartment to the lower compartment, substantially as set forth.

4E. The combination, with the main boiler B and heating-compartment A, of the feed-pipes I, I', and N, the escape-pipe N', joined in the common cross-tting n, and their cocks or Valves 4, 5, 6, and 7, as and for the purpose shown and described.

5. The combination, substantially as de- 2o JOSEPH H. HOADLEY.

VVituesses:

F. C. PEARsoN, CHAS. S. PEcK. 

